lecture 18

Question 1

what does each letter of PECOT stand for

Answer 1

population
exposure
comparison
outcome
time

Question 2

in gate frame, define source

Answer 2

Population the sample is recruited from, those in the population eligible to be in study

Question 3

in gate frame define sample

Answer 3

the people from the sample who were in the study

Question 4

what are we aiming to do in analytic epidemiology

Answer 4

In analytic epidemiology, we want to quantify the degree to which an exposure increases or decreases the occurrence of the outcome

Question 5

whats relative risk

Answer 5

ratio of incidences:
I exposed
——————
I comparison

Question 6

whats the null value of relative risk and whats this mean

Answer 6

Exposure doesn’t change occurrence of outcome, so no association between exposure and outcome, the null value is one 1.

Question 7

Interpreting relative risk for incidence proportions and incidence rate

Answer 7

the exposed group were x times as likely to develop outcome compared to comparison group

Question 8

risk difference can be called

Answer 8

attributable risk

Question 9

whats risk difference calculation

Answer 9

Ie - Ic

Question 10

whats null value for risk difference and what does this mean

Answer 10

icidence for both groups is equal so there is no association. the value is 0.

Question 11

interpreting risk difference for Ip

Answer 11

there were x amount more/less per x (people over time) of outcome in exposed group compared to comparison.

Question 12

interpreting risk difference for IR

Answer 12

there were x amount more/less cases per person year of exposure in exposed group compared to comparison group